2003A&A...410..143C

Query : 2003A&A...410..143C

2003A&A...410..143C - Astronomy and Astrophysics, volume 410143-154 (2003/10-4)

Proton capture elements in the globular cluster NGC 2808. I. First detection of large variations in sodium abundances along the Red Giant Branch.

CARRETTA E., BRAGAGLIA A., CACCIARI C. and ROSSETTI E.

Abstract (from CDS):

We have used spectra obtained as part of the Science Verification program of the FLAMES multi-object spectrograph mounted on Kueyen (VLT-UT2) to perform an abundance analysis of stars along the giant branch (RGB) in the globular cluster NGC 2808. Sodium abundances are derived from Na D lines for a sample of 81 cluster stars spanning a range of about 2mag from the tip of the RGB. Our results show that a large star-to-star scatter does exist at all positions along the RGB, suggesting large variations in the abundance of proton capture elements down to luminosities comparable to the red horizontal branch (HB). The distribution of Na abundances along the RGB seems to point out that in this cluster most of the observed spread has a primordial origin. Overimposed evolutionary effects, if any, must be only at ``noise'' level, at odds with results from a similar analysis in M13 (Pilachowski et al., 1996AJ....112..545P). This study is a first step towards ascertaining if a link exists between the distribution of chemical anomalies in light elements along the RGB and the global properties of globular clusters, in particular the HB morphology.

Abstract Copyright: ∼

Journal keyword(s): stars: abundances - stars: evolution - stars: Population II - galaxy: globular clusters: general - galaxy: globular clusters: individual: NGC 2808

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

CDS comments: Table 1: Cl* NGC 2808 PKD NNNNN, see 2002A&A...391..945P.

Simbad objects: 89

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Number of rows : 89
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl* NGC 2808 PKD 33918 RG* 09 11 01.6894011672 -64 51 36.042636456   15.784 14.417   12.925 ~ 23 0
2 Cl* NGC 2808 PKD 31851 RG* 09 11 14.3690043144 -64 53 36.038378184   16.425 15.305   14.038 ~ 18 0
3 Cl* NGC 2808 PKD 32469 * 09 11 16.3261261608 -64 52 55.939775952   15.485 14.040     ~ 9 0
4 Cl* NGC 2808 PKD 32924 RG* 09 11 22.2971348640 -64 52 31.067245344   16.138 14.853     ~ 15 0
5 Cl* NGC 2808 PKD 30523 RG* 09 11 22.4892602352 -64 55 23.361829104   16.658 15.489     ~ 10 0
6 Cl* NGC 2808 PKD 35265 RG* 09 11 22.7193948024 -64 50 12.039380520   16.551 15.377   14.017 ~ 14 0
7 Cl* NGC 2808 PKD 32685 * 09 11 27.0766064136 -64 52 44.362792668   16.794 15.656     ~ 7 0
8 Cl* NGC 2808 PKD 13575 RG* 09 11 31.6291677456 -64 49 02.247435048   16.612 15.449   14.093 ~ 16 0
9 Cl* NGC 2808 PKD 30900 * 09 11 36.3279809904 -64 54 47.110301748   16.319 15.084     ~ 12 0
10 Cl* NGC 2808 PKD 32909 * 09 11 39.6813838032 -64 52 31.940480172   16.272 15.022     ~ 5 0
11 Cl* NGC 2808 PKD 13983 * 09 11 39.7874822232 -64 48 25.399119024   17.027 15.940     ~ 8 0
12 Cl* NGC 2808 PKD 32862 * 09 11 42.0470963577 -64 52 34.163844798   16.379 15.24     ~ 9 0
13 Cl* NGC 2808 PKD 50910 * 09 11 42.6592567848 -64 51 27.324970056   16.234 14.984     ~ 5 0
14 Cl* NGC 2808 PKD 48011 RG* 09 11 48.0244289832 -64 52 12.278485488   15.718 14.397     ~ 10 0
15 Cl* NGC 2808 PKD 40983 RG* 09 11 48.6829291344 -64 54 20.780404776   15.723 14.360     ~ 10 0
16 Cl* NGC 2808 PKD 42789 * 09 11 48.9504203208 -64 53 41.405747136   16.476 15.367     ~ 3 0
17 Cl* NGC 2808 PKD 51646 * 09 11 50.3544405024 -64 51 15.423468840   16.550 15.460     ~ 6 0
18 Cl* NGC 2808 PKD 41969 * 09 11 50.9092596216 -64 53 57.645032496   15.787 14.446     ~ 8 0
19 Cl* NGC 2808 PKD 8739 RG* 09 11 51.2017826880 -64 48 37.535678100   15.721 14.332   12.779 ~ 23 0
20 Cl* NGC 2808 PKD 48128 SB? 09 11 52.19 -64 52 10.6   15.825 14.55     ~ 7 0
21 Cl* NGC 2808 PKD 50866 * 09 11 54.2822927328 -64 51 27.930636288   15.941 14.634     ~ 6 0
22 Cl* NGC 2808 PKD 54284 RG* 09 11 54.7807591296 -64 50 33.677300796   15.789 14.407     ~ 10 0
23 Cl* NGC 2808 PKD 48060 * 09 11 55.2043303584 -64 52 11.450250984   15.256 13.556     ~ 5 0
24 Cl* NGC 2808 PKD 49509 * 09 11 56.2205662320 -64 51 49.110901452   15.429 13.921     ~ 2 0
25 Cl* NGC 2808 PKD 47421 * 09 11 56.4474689568 -64 52 21.280310400   15.571 14.175     ~ 5 0
26 Cl* NGC 2808 PKD 10265 RG* 09 11 56.6800278144 -64 47 00.526187832   15.711 14.359   12.886 ~ 15 0
27 Cl* NGC 2808 PKD 7788 RG* 09 11 57.1963946520 -64 49 14.567412792   16.202 14.974   13.578 ~ 15 0
28 Cl* NGC 2808 PKD 47145 * 09 11 58.19160 -64 52 25.8240   15.249 13.647     ~ 2 0
29 Cl* NGC 2808 PKD 55031 * 09 11 58.2054033000 -64 50 21.703854228   15.283 13.600     ~ 3 0
30 Cl* NGC 2808 PKD 43822 * 09 11 58.5012846288 -64 53 22.336934172   15.931 14.600     ~ 4 0
31 2MASS J09115856-6447230 RG* 09 11 58.5644064240 -64 47 23.126602704   15.651 14.266   12.761 ~ 11 0
32 Cl* NGC 2808 PKD 51515 * 09 11 59.39520 -64 51 17.4348   15.812 14.213     ~ 3 0
33 Cl* NGC 2808 PKD 54789 * 09 12 00.4331026128 -64 50 25.560679812   15.626 14.247     ~ 5 0
34 Cl* NGC 2808 PKD 46367 * 09 12 00.4651552176 -64 52 38.809865604   16.054 14.832     ~ 3 0
35 Cl* NGC 2808 PKD 46041 * 09 12 03.00312 -64 52 44.3100   16.166 14.967     ~ 3 0
36 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
37 Cl* NGC 2808 PKD 55627 * 09 12 05.4257448216 -64 50 11.376985740   15.899 14.585     ~ 2 0
38 Cl* NGC 2808 PKD 51871 LP? 09 12 05.4486720187 -64 51 11.855366600   15.309 13.542     ~ 4 0
39 Cl* NGC 2808 PKD 54733 * 09 12 07.8100278048 -64 50 26.375069976   15.602 14.128     ~ 3 0
40 Cl* NGC 2808 PKD 50371 * 09 12 07.98 -64 51 35.8   15.464 13.840     ~ 3 0
41 Cl* NGC 2808 PKD 41828 RG* 09 12 08.5587458208 -64 54 00.644854536   15.862 14.521     ~ 10 0
42 2MASS J09120887-6455277 RG* 09 12 08.8710554568 -64 55 27.752791476   16.432 15.317   14.032 ~ 12 0
43 Cl* NGC 2808 PKD 38244 RG* 09 12 08.9353073664 -64 56 07.942511184   16.393 15.259   13.961 ~ 14 0
44 Cl* NGC 2808 PKD 46868 * 09 12 09.7828 -64 52 30.452   16.003 14.752     ~ 5 0
45 Cl* NGC 2808 PKD 8826 RG* 09 12 09.8051444016 -64 48 33.218930304   16.250 15.082   13.760 ~ 15 0
46 Cl* NGC 2808 PKD 49680 * 09 12 10.0632367272 -64 51 46.451658060   15.256 13.567     ~ 6 0
47 Cl* NGC 2808 PKD 43247 * 09 12 10.15 -64 53 32.6   16.022 14.786     ~ 5 0
48 Cl* NGC 2808 PKD 50861 * 09 12 11.0889963264 -64 51 27.853059708   15.201 13.556     ~ 5 0
49 Cl* NGC 2808 PKD 45840 * 09 12 11.13 -64 52 47.4   15.552 14.117     ~ 3 0
50 Cl* NGC 2808 PKD 55437 * 09 12 11.4649223064 -64 50 14.667628884   15.982 14.692     ~ 2 0
51 Cl* NGC 2808 PKD 49942 * 09 12 12.10 -64 51 42.5   15.400 13.736     ~ 2 0
52 Cl* NGC 2808 PKD 37998 RG* 09 12 12.5567032776 -64 56 24.588303036   15.638 14.233     ~ 13 0
53 2MASS J09121334-6448114 RG* 09 12 13.3492296480 -64 48 11.602585332   15.529 14.054   12.468 ~ 10 0
54 Cl* NGC 2808 PKD 37496 RG* 09 12 13.8832846776 -64 57 09.402518592   16.126 14.871     ~ 9 0
55 Cl* NGC 2808 PKD 8603 RG* 09 12 14.0467933080 -64 48 42.899736852   15.847 14.432     ~ 21 0
56 Cl* NGC 2808 PKD 39060 RG* 09 12 14.5240292760 -64 55 24.064654872   15.793 14.417     ~ 9 0
57 Cl* NGC 2808 PKD 44665 RG* 09 12 15.2809298856 -64 53 07.334620800   15.649 14.245     ~ 11 0
58 Cl* NGC 2808 PKD 42073 * 09 12 16.2181259424 -64 53 55.150489140   15.702 14.291     ~ 3 0
59 Cl* NGC 2808 PKD 46663 * 09 12 17.1043861656 -64 52 33.907128888   15.860 14.551     ~ 8 0
60 Cl* NGC 2808 PKD 41008 RG* 09 12 17.6783706816 -64 54 19.833491556   16.339 15.189     ~ 16 0
61 2MASS J09121810-6451094 AB* 09 12 18.1077432960 -64 51 09.467128872   15.628 14.376   12.990 ~ 15 0
62 Cl* NGC 2808 PKD 7558 RG* 09 12 20.1245103720 -64 49 21.885666384   16.576 15.389     ~ 9 0
63 Cl* NGC 2808 PKD 10105 RG* 09 12 21.1451574840 -64 47 13.889998644   15.958 14.717   13.308 ~ 22 0
64 Cl* NGC 2808 PKD 45443 Pe* 09 12 21.3744174000 -64 52 54.103476720   15.885 14.574     ~ 8 0
65 2MASS J09122151-6450338 RG* 09 12 21.5171100744 -64 50 33.729479556   16.483 15.387   14.101 ~ 13 0
66 Cl* NGC 2808 PKD 42996 RG* 09 12 25.0618461864 -64 53 37.211471376   16.552 15.426     ~ 9 0
67 Cl* NGC 2808 PKD 10341 RG* 09 12 25.4134209432 -64 46 52.398005016   15.997 14.708   13.308 ~ 17 0
68 Cl* NGC 2808 PKD 43794 RG* 09 12 26.3451501936 -64 53 22.581072528   15.861 14.554     ~ 10 0
69 2MASS J09122762-6451100 RG* 09 12 27.6381518160 -64 51 10.113163416   15.665 14.270   12.727 ~ 13 0
70 2MASS J09122929-6451188 RG* 09 12 29.2978287624 -64 51 18.908221428   16.207 15.010   13.653 ~ 11 0
71 Cl* NGC 2808 PKD 55609 RG* 09 12 29.9342071224 -64 50 11.369071716   16.084 14.817   13.386 ~ 15 0
72 2MASS J09123015-6449519 RG* 09 12 30.1640751480 -64 49 52.032423864   16.592 15.482   14.178 ~ 13 0
73 Cl* NGC 2808 PKD 38228 RG* 09 12 30.9730576536 -64 56 08.516146560   16.211 14.981     ~ 19 0
74 Cl* NGC 2808 PKD 56136 * 09 12 30.9843433032 -64 50 02.006402964   17.408 16.383     ~ 2 0
75 Cl* NGC 2808 PKD 7536 RG* 09 12 31.6995250872 -64 49 22.267134228   15.769 14.417   12.911 ~ 20 0
76 Cl* NGC 2808 PKD 42165 * 09 12 33.7984958832 -64 53 52.909534860   17.430 16.387     ~ 2 0
77 Cl* NGC 2808 PKD 49743 RG* 09 12 36.8014065984 -64 51 45.082943280   16.353 15.168     ~ 20 0
78 2MASS J09124003-6453358 RG* 09 12 40.0494639696 -64 53 35.916772308   15.338 13.786   12.103 ~ 10 0
79 Cl* NGC 2808 PKD 10571 RG* 09 12 41.1212222904 -64 46 25.847795244   15.806 14.376     ~ 21 0
80 Cl* NGC 2808 PKD 10201 * 09 12 45.7572335424 -64 47 05.394692724   16.864 15.76     ~ 9 0
81 Cl* NGC 2808 PKD 44984 RG* 09 12 45.8811905712 -64 53 01.402724040   15.871 14.597   13.168 ~ 22 0
82 Cl* NGC 2808 PKD 42886 * 09 12 59.1099665064 -64 53 38.609212920   17.019 15.921     ~ 12 0
83 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
84 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
85 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
86 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
87 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
88 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
89 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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